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Item type:Publication, Seamless integration of conducting hydrogels in daily life: From preparation to wearable application(John Wiley and Sons Inc, 2024-04-03)Conductive hydrogels (CHs) have received significant attention for use in wearable devices because they retain their softness and flexibility while maintaining high conductivity. CHs are well suited for applications in skin-contact electronics and biomedical devices owing to their high biocompatibility and conformality. Although highly conductive hydrogels for smart wearable devices are extensively researched, a detailed summary of the outstanding results of CHs is required for a comprehensive understanding. In this review, the recent progress in the preparation and fabrication of CHs is summarized for smart wearable devices. Improvements in the mechanical, electrical, and functional properties of high-performance wearable devices are also discussed. Furthermore, recent examples of innovative and highly functional devices based on CHs that can be seamlessly integrated into daily lives are reviewed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, High-permittivity polymer–matrix composites for the development of triboelectric nanogenerators (TENGs) with enhanced performance: A review(Springer, 2024-08-01)In recent years, the rapid increase in low-power electronics has shifted research focus towards new energy-harvesting devices. Triboelectric energy-harvesting technologies, such as triboelectric nanogenerators (TENGs), offer an efficient way to convert mechanical energy into electrical energy through the triboelectric effect. Polymers are used to fabricate crucial components in TENGs, acting as the triboelectric layers and storing electric charge. The dielectric properties of these polymers significantly influence the energy conversion capabilities of TENGs. High-permittivity polymer-based composites and nanocomposites have been studied for energy storage, such as capacitors, supercapacitors, and solar cells among others. These high-permittivity polymer composites can also be used to develop novel TENGs with high output performance. This paper reviews the development of high-dielectric-permittivity polymeric composites to be used as active triboelectric surfaces for TENGs with enhanced output performance. One strategy involves incorporating inorganic materials, semiconductors, conductors, and carbon-derived materials as an active phase within the polymer matrix. Other strategies, including the usage of polymeric fillers, coating, polarization, and ion implantation techniques, are also reported. This review may serve as a reference for optimizing polymer-based dielectrics in energy-harvesting-related areas. Through a deeper understanding of these techniques and materials, we can enhance the performance of TENGs to achieve high output efficiency.1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Ulvan-based materials doped with lithium sulfate salts as solid biopolymer electrolytes for energy storage applications(Elsevier B.V., 2024-03-01)The conversion of algae biomass into high-value technological materials can promote the utilization of green algae and mitigate issues such as green tides and biofouling. This paper reports, for the first time, the utilization of ulvan in the production of solid biopolymer electrolytes (SBEs) doped with lithium sulfate salts. Ulvan were obtained from the green algae Ulva nematoidea using two different processing methods: hot water extraction and alkaline extraction. Hot water extraction enables the extraction of ulvan chains with a high molecular weight. In contrast, alkaline extraction produces a heterogeneous molecular weight distribution with Mw values of 730 kDa, 339 kDa, and 380 kDa. Frequency-dependent conductivity plots showed that SBEs made from ulvan extracted using the alkaline route featured higher conductivity than those SBEs made from water-extracted ulvan. The highest conductivity was obtained with ulvan extracted using the alkaline procedure, measuring 1.73 × 10−5 S/cm (tested at 10 MHz and 80 °C). The open conformation and low molecular weight of the ulvan extracted using the alkaline route would promote the segmental movement of ulvan chains and the mobility of Li+ ions. The results showed that ulvan can be used to produce solid-state electrolytes (SBEs) doped with Li-ion salt. The extraction procedure, Li-ion salt concentration, temperature, and frequency are essential variables that determine the conductivity of SBEs.